WO2000040545A1 - Nouveau procede de preparation d'aminoacides chiraux - Google Patents

Nouveau procede de preparation d'aminoacides chiraux Download PDF

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Publication number
WO2000040545A1
WO2000040545A1 PCT/FR2000/000020 FR0000020W WO0040545A1 WO 2000040545 A1 WO2000040545 A1 WO 2000040545A1 FR 0000020 W FR0000020 W FR 0000020W WO 0040545 A1 WO0040545 A1 WO 0040545A1
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Prior art keywords
radical
carbon atoms
alkyl
chosen
radical containing
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PCT/FR2000/000020
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English (en)
French (fr)
Inventor
Isabelle Pelta
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Aventis Cropscience
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Application filed by Aventis Cropscience filed Critical Aventis Cropscience
Priority to BRPI0008586-3A priority Critical patent/BR0008586B1/pt
Priority to CA002358116A priority patent/CA2358116A1/fr
Priority to JP2000592255A priority patent/JP2002534407A/ja
Priority to AT00900532T priority patent/ATE258161T1/de
Priority to US09/869,939 priority patent/US6683190B1/en
Priority to DK00900532T priority patent/DK1140794T3/da
Priority to IL14417300A priority patent/IL144173A/en
Priority to AU30511/00A priority patent/AU3051100A/en
Priority to DE60007835T priority patent/DE60007835T2/de
Priority to EP00900532A priority patent/EP1140794B1/fr
Publication of WO2000040545A1 publication Critical patent/WO2000040545A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C227/00—Preparation of compounds containing amino and carboxyl groups bound to the same carbon skeleton
    • C07C227/30—Preparation of optical isomers
    • C07C227/32—Preparation of optical isomers by stereospecific synthesis
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C227/00—Preparation of compounds containing amino and carboxyl groups bound to the same carbon skeleton
    • C07C227/24—Preparation of compounds containing amino and carboxyl groups bound to the same carbon skeleton from hydantoins
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/582—Recycling of unreacted starting or intermediate materials

Definitions

  • the present invention relates to a new process for the preparation of chiral amino acids from racemic hydantoins and the use of said chiral amino acids as intermediates for the synthesis of chiral organic compounds.
  • Industrial processes - industrial processes mean all preparation processes other than laboratory preparations - for the preparation of chiral amino acids therefore require enantioselective syntheses, that is to say syntheses which lead only to the desired enantiomer and this with a high enantiomeric purity.
  • patent EP-A-739978 presents a process for the preparation of optically pure amino acids from racemic hydantoins.
  • This type of process has the disadvantage of carrying out an enzymatic reaction and of comprising several stages. This has a direct consequence on the complexity of the industrial process, on the yields of product obtained and on the manufacturing costs.
  • An object of the present invention is to provide a process for the preparation of chiral amino acids from racemic hydantoins which does not have the drawbacks mentioned above.
  • a further object of the present invention is to provide a process for the preparation of substantially enantiomerically pure amino acids from racemic hydantoins, a process which is easily industrializable and of low cost.
  • the present invention consists of a new process for the preparation of chiral amino acids of formula (I):
  • R, and R 2 are different and are chosen from: - an alkyl or haloalkyl radical containing from 1 to 6 carbon atoms in linear chain or branched; an alkoxyalkyl, alkylthioalkyl, alkylsulfonylalkyl, monoalkylaminoalkyl, alkenyl or alkynyl radical containing from 2 to 6 carbon atoms in straight or branched chain; - a dialkylaminoalkyl or cycloalkyl radical containing from 3 to 7 carbon atoms in a linear or branched chain;
  • aryl radical that is to say phenyl, naphthyl, thienyl, furyl, pyridyl, benzothienyl, benzofuryl, quinolinyl, isoquinolinyl, or methylenedioxyphenyl, optionally substituted by 1 to 3 groups chosen from R 6 ;
  • arylalkyl, aryloxyalkyl, arylthioalkyl or arylsulfonylalkyl radical the terms aryl and alkyl having the definitions given above; or - Ri and R2 can form, with the carbon to which they are linked on the ring, a carbocycle or a heterocycle comprising from 5 to 7 atoms, these rings being able to be fused with a phenyl, optionally substituted by 1 to 3 groups chosen from ⁇ ;
  • R 6 represents a radical chosen from:
  • cycloalkyl halocycloalkyl, alkenyloxy, alkynyloxy, alkenylthio, alkynylthio radical containing from 3 to 6 carbon atoms;
  • an amino radical optionally mono or disubstituted by an alkyl or acyl radical containing from 1 to 6 carbon atoms or alkoxycarbonyl containing from 2 to 6 carbon atoms; and a phenyl, phenoxy or pyridyloxy radical, these radicals being optionally substituted with 1 to 3 groups, identical or different, chosen from R 7 ; and
  • R 7 represents a radical chosen from: - a halogen atom chosen from fluorine, chlorine, bromine and iodine;
  • alkyl radical linear or branched, containing from 1 to 6 carbon atoms
  • alkoxy or alkylthio radical linear or branched, containing from 1 to 6 carbon atoms
  • - a haloalkoxy or haloalkylthio radical linear or branched, containing from 1 to 6 carbon atoms
  • the chiral amino acids thus obtained can be used as synthesis intermediates in the preparation of chiral active materials useful in particular in therapy or in agriculture.
  • these chiral amino acids can be used as intermediates in the preparation of certain 2-imidazoline-5-ones and 2-imidazoline-5-thiones fungicides described in patent EP-A-0 629 616.
  • the present invention relates to a new process for the preparation of chiral amino acids of formula (I):
  • R, and R 2 are different and are chosen from:
  • alkyl or haloalkyl radical containing from 1 to 6 carbon atoms in a linear or branched chain
  • alkenyl or alkynyl radical containing from 2 to 6 carbon atoms in straight or branched chain
  • - a dialkylaminoalkyl or cycloalkyl radical containing from 3 to 7 carbon atoms in a linear or branched chain; - an aryl radical, that is to say phenyl, naphthyl, thienyl, furyl, pyridyl, benzothienyl, benzofuryl, quinolinyl, isoquinolinyl, or methylenedioxyphenyl, optionally substituted with 1 to 3 groups chosen from R ⁇ ; and
  • arylalkyl an arylalkyl, aryloxyalkyl, arylthioalkyl or arylsulfonylalkyl radical, the terms aryl and alkyl having the definitions given above; or
  • R - R, and R 2 can form, with the carbon to which they are linked on the ring, a carbocycle or a heterocycle comprising from 5 to 7 atoms, these rings being able to be fused with a phenyl, optionally substituted by 1 to 3 groups chosen from R ,,;
  • Rg represents a radical chosen from:
  • cycloalkyl halocycloalkyl, alkenyloxy, alkynyloxy, alkenylthio, alkynylthio radical containing from 3 to 6 carbon atoms;
  • R 7 represents a radical chosen from:
  • halogen atom chosen from fluorine, chlorine, bromine and iodine
  • alkyl radical linear or branched, containing from 1 to 6 carbon atoms
  • alkoxy or alkylthio radical linear or branched, containing from 1 to 6 carbon atoms
  • haloalkoxy or haloalkylthio radical linear or branched, containing from 1 to 6 carbon atoms
  • the chiral amino acids of formula (I) are such that:
  • R represents an aryl radical, optionally substituted with 1 to 3 R ⁇ groups; as defined above, and
  • R 2 represents an alkyl or haloalkyl radical containing from 1 to 6 carbon atoms in a linear or branched chain.
  • amino acids of formula (I) are such that:
  • - R represents a phenyl radical, optionally substituted by a group R ⁇ as defined above, and - R 2 represents an alkyl radical chosen from methyl, ethyl, linear or branched propyl, linear or branched butyl, linear or branched pentyl and hexyl linear or branched.
  • asterisk (*) carried by the asymmetric carbon in formula (I) signifies that the amino acid is chiral, that is to say that the amino acid is of configuration S or R.
  • the process according to the invention allows to obtain chiral amino acids.
  • chiral amino acids is meant the substantially pure enantiomers, either of configuration S, or of configuration R.
  • substantially pure means that the enantiomeric excess of the enantiomer considered is greater than 80%, more particularly greater than 90%.
  • enantiomeric excess is meant the ratio of the excess of the desired enantiomer to the unwanted enantiomer.
  • the method according to the invention is characterized in that an enantiomeric splitting agent is brought into contact with a racemic hydantoin of formula (II):
  • R, and R 2 are as defined above.
  • racemic hydantoin is meant a hydantoin of formula (II) substantially non-optically active, that is to say of which one enantiomer is not substantially preponderant with respect to the other.
  • the method of the invention therefore consists in:
  • the first operation of the process of the invention consists in mixing, with stirring and in a suitably chosen solvent, a racemic hydantoin of formula (II) as defined above, a resolving agent and a base.
  • the reaction medium can optionally be heated to allow complete dissolution of the reactants.
  • the precipitate obtained is separated and mixed with a basic aqueous solution.
  • the solution thus obtained is treated in order to separate the resolving agent.
  • This separation can be carried out by any process known to those skilled in the art; particularly advantageously, this separation is carried out by distillation, preferably under reduced pressure. The same is done to separate the resolving agent contained in the filtrate.
  • the resolving agent can be separated and recovered in a substantially quantitative manner and be directly reused, without further processing, in a new cycle of preparation of chiral amino acid.
  • the hydantoin salt solution is subjected to hydrolysis. This operation can advantageously be carried out by simple heating of the reaction medium.
  • the desired chiral amino acid is recovered according to conventional methods, after neutralization of the medium.
  • the resolution agent used in the process of the present invention can be any resolution agent known to a person skilled in the art specialized in the art of asymmetric synthesis.
  • This splitting agent is of any type suitable for the envisaged reaction and is a chiral (or asymmetric) compound of precise and known configuration generally defined by the terms dextrorotatory or levorotatory which reflect the optical activity of this compound.
  • This splitting agent can be chosen, for example, from chiral splitting agents, such as for example chiral amines, such as quinine, cinchonidine, dehydroabiethylamine, ephedrine, 2-amino-1-phenyl-1 , 3-propanediol, ⁇ -methylbenzylamine, ⁇ - (l-naphthyl) ethylamine, or 2-phenylglycinol, and chiral acids, such as tartaric acid, dibenzoyltartric acid, malic acid, camphosulfonic acid, mandelic acid, or the phencyphos.
  • chiral amines such as quinine, cinchonidine, dehydroabiethylamine, ephedrine, 2-amino-1-phenyl-1 , 3-propanediol, ⁇ -methylbenzylamine, ⁇ - (l-naphthyl) ethylamine, or
  • the chiral splitting agent used for the process of the invention is ⁇ -methylbenzylamine dextrorotatory (+) - ⁇ -MBA or ⁇ -methylbenzylamine levorotatory (-) - ⁇ -MBA depending on whether one wishes to prepare a dextrorotatory amino acid, levorotatory respectively.
  • This splitting agent is for example described in patent WO-A-92/08702 or in the publication by G. Coquerel et al., Chirality, 4, (1992), 400-403.
  • the process for preparing chiral amino acids according to the invention can be carried out using at most one equivalent, for example from 0.2 to 1 equivalent, of splitting agent relative to the amount of racemic hydantoin , and this, by introducing a base into the reaction medium during the contacting of the racemic hydantoi e with the resolving agent.
  • This base can be an organic base or an inorganic base.
  • inorganic bases for the process according to the invention, mention may be made of hydroxides, for example hydroxides of alkali or alkaline earth metals, for example sodium hydroxide or alternatively potassium hydroxide.
  • organic base which can be used for the process of the invention there may be mentioned amines, preferably tertiary amines, for example triethylamine.
  • the base used for the process of the invention is present in the reaction medium in an amount between 0.2 and 0.8 equivalent relative to the amount of racemic hydantoin present at the start.
  • alkali or alkaline earth metal hydroxides preferably sodium hydroxide or potassium hydroxide.
  • the base used is sodium hydroxide.
  • the amount of base used varies between 0.1 and 0.9 equivalents of base relative to the amount of starting racemic hydantoin, preferably between 0.4 and 0.6, for example 0.5 equivalents.
  • the racemic hydantoin of formula (II) is dissolved.
  • This dissolution is carried out in an organic or inorganic solvent, or in a mixture of organic or inorganic solvents or also in a mixture of organic and inorganic solvents.
  • organic solvent preferably means polar protic or aprotic solvents, such as alcohols or ketones, for example methanol, ethanol or dimethyl ketone.
  • inorganic solvent is understood here again preferably to mean polar solvents, for example water.
  • water will preferably be chosen as the solvent for hydantoin, more preferably a water / co-solvent system, the said co-solvent being advantageously chosen from methanol, ethanol or acetone, the proportions of the various constituents of this solvent, water / co-solvent, are chosen such that they make it possible to obtain a concentration of hydantoin in the reaction medium of between 5 and 30% by weight.
  • a ratio of water / co-solvent quantities between 90/10 and 30/70 is chosen, depending on the nature of the co-solvent.
  • the nature of the solvent for racemic hydantoin is particularly interesting: in fact, a high solvating power leads to a high concentration of hydantoin in the reaction medium, and consequently considerably limits the volume of effluents. This last aspect is particularly important in the case of an industrial process.
  • the dissolution of hydantoin can also be facilitated by heating the reaction medium.
  • the reaction medium can be heated to temperatures between 40 ° C and 80 ° C, for example between 50 ° C and 60 ° C.
  • the enantiomeric splitting agent is separated directly from the basic reaction medium which can then be reused for the process of the invention. This separation is carried out by any process known to those skilled in the art. According to a very particularly preferred aspect of the invention, this separation is carried out by distillation.
  • the reaction medium then contains a solution of basic salt of chiral hydantoin, free of any splitting agent, a salt which is not isolated, but directly transformed into the salt of the corresponding chiral amino acid.
  • This hydrolysis can here again be carried out according to any process known in the literature. For example, the hydrolysis is carried out by simple heating, at temperatures varying from 50 ° C to 250 ° C, preferably from 100 ° C to 200 ° C, with reaction times varying from a few minutes to more than 20 hours, depending on the temperature chosen.
  • the expected chiral amino acid is isolated from the reaction medium according to the conventional techniques used in this field, such as neutralization, washing (s), recrystallization (s), distillation (s), drying (s), etc.
  • One or more of these techniques can be carried out simultaneously or consecutively, under operating conditions known to those skilled in the art who will be able to choose the appropriate reagents and reaction conditions that are adapted to each case.
  • chiral amino acids of formula (I) defined above obtained according to the process of the invention find a particularly advantageous application as synthesis intermediates in the development of chiral active materials useful in particular in therapy or in agriculture.
  • the chiral amino acids of formula (I) can be used as intermediates in the preparation of certain 2-imidazoline-5-ones and 2-imidazoline-5-thiones fungicides described in patent EP-A-0 629 616 of formula (AT) :
  • R, and R 2 are as defined above for the amino acids of formula (I) and
  • M represents an oxygen or sulfur atom, or a CH2 radical, optionally halogen
  • alkoxyalkyl alkylthioalkyl, haloalkyl, cyanoalkyl, thiocyanatoalkyl, alkenyl or alkynyl radical containing from 2 to 6 carbon atoms, or - a dialkylaminoalkyl, alkoxycarbonylalkyl radical, or
  • N-alkylcarbamoylalkyle containing from 3 to 6 carbon atoms, or - an N, N-dialkylcarbamoylalkyl radical containing from 4 to 8 carbon atoms, or
  • an aryl radical comprising phenyl, naphthyl, thienyl, furyl, pyridyl, pyrimidyl, pyridazinyl, pyrazinyl, benzothienyl, benzofuryl, quinolinyl, isoquinolinyl, or methylene dioxyphenyl, optionally substituted with 1 to 3 groups chosen from R ⁇ , or
  • arylalkyl an arylalkyl, aryloxyalkyl, arylthioalkyl or arylsulfonylalkyl radical, the terms aryl and alkyl having the definitions given above;
  • alkoxyalkyl an alkoxyalkyl, alkylthioakyle, acyl, alkenyl, alkynyl, haloacyl, alkoxycarbonyl, haloalkoxycarbonyl, alkoxyalkylsulfonyl, cyanoalkylsulfonyl radical containing from 2 to 6 carbon atoms or
  • alkoxyalkoxycarbonyl alkylthioalkoxycarbonyl, cyanoalkoxycarbonyl radical containing from 3 to 6 carbon atoms or,
  • arylalkylcarbonyl in particular phenylacetyl and phenylpropionyl
  • arylcarbonyl in particular benzoyl, optionally substituted with 1 to 3 groups from R 6 , thienylcarbonyl, furylcarbonyl, pyridylcarbonyl, benzyloxycarbonyl, furfuryloxycarbonyl, tetrahydrofurfuryloxycarbonyl, phenylcarbonoxycarbonyl, carboxyoxycarbonyl, phenoxycarbonyl optionally substituted with 1 to 3 groups chosen from R ⁇ alkylthiolcarbonyl, haloalkylthiolcarbonyl, alkoxyalkylthiolcarbonyl, cyanoalkylthiolcarbonyl, benzylthiolcarbonyl, furfurylthiolcarbonyl, tetrahydrofurfurylthiolcarbonyl, thienyl
  • alkylthioalkylsulfonyl group containing from 3 to 8 carbon atoms or cycloalkylsulfonyl containing from 3 to 7 carbon atoms;
  • R 4 and R 5 taken together can also form with the nitrogen atom to which they are attached a pyrrolidino, piperidino, morpholino or piperazino group optionally substituted by an alkyl radical containing from 1 to 3 carbon atoms.
  • cycloalkyl halocycloalkyl, alkenyloxy, alkynyloxy, alkenylthio, alkynylthio radical containing from 3 to 6 carbon atoms or
  • an amino radical optionally mono or disubstituted by an alkyl or acyl radical containing from 1 to 6 carbon atoms or alkoxycarbonyl containing from 2 to 6 carbon atoms, - a phenyl, phenoxy or pyridyloxy radical, these radicals being optionally substituted by 1 to 3 groups, identical or different, chosen from R 7 ,
  • R 7 represents: - a halogen atom chosen from fluorine, chlorine, bromine, iodine or,
  • R represents a hydroxy, alkoxy radical containing from 1 to 6 carbon atoms, benzyloxy, an amino, alkylamino or dialkylamino radical, an alkylamino radical containing from 1 to 6 carbon atoms
  • X represents a leaving group such as a halogen atom, chosen from chlorine, bromine and iodine, or a sulfate radical, or alkylsulfonyloxy or arylsulfonyloxy.
  • Step (a) is the process of the present invention and is exemplified in the rest of this description;
  • the reaction medium is heated to 50 ° C for 1 hour 30 minutes and then cooled to 10 ° C.
  • the precipitate is filtered and then washed with water.
  • the reaction medium is then brought to 140 ° C. for 4 h.
  • reaction medium After cooling to 25 ° C, the reaction medium is acidified with a 33% aqueous hydrochloric acid solution.
  • the precipitate of chiral amino acid obtained is then filtered, which is then washed (water, acetone) and then dried under vacuum.
  • the expected dextrorotatory chiral amino acid is obtained with a yield of 32% relative to the starting racemic hydantoin and an enantiomeric excess of 97%.
  • EXAMPLE 2 In a solvent consisting of water and methanol in a 70/30 ratio and with stirring, racemic 5-methyl-5-phenylhydantoin, R - (+) - ⁇ - methylbenzylamine (0, 9 equivalent relative to the amount of racemic 5-methyl-5-phenylhydantoin) and soda (0.5 equivalent relative to the amount of racemic 5-methyl-5-phenylhydantoin).
  • the reaction medium is heated at 55 ° C for 30 min. then it is cooled to 20 ° C.
  • the precipitate obtained is filtered and then washed with water.
  • reaction medium is then heated at 160 ° C for 4 h. After cooling to 25 ° C, the reaction medium is acidified with a 33% aqueous hydrochloric acid solution.
  • the precipitate of chiral amino acid obtained is then filtered, then washed and finally dried.
PCT/FR2000/000020 1999-01-07 2000-01-07 Nouveau procede de preparation d'aminoacides chiraux WO2000040545A1 (fr)

Priority Applications (10)

Application Number Priority Date Filing Date Title
BRPI0008586-3A BR0008586B1 (pt) 1999-01-07 2000-01-07 processo de preparação de aminoácidos quirais e processo de preparação dos compostos de fórmula (a).
CA002358116A CA2358116A1 (fr) 1999-01-07 2000-01-07 Nouveau procede de preparation d'aminoacides chiraux
JP2000592255A JP2002534407A (ja) 1999-01-07 2000-01-07 キラルアミノ酸の新規な製造方法
AT00900532T ATE258161T1 (de) 1999-01-07 2000-01-07 Verfahren zur herstellung von chiralen aminosäuren
US09/869,939 US6683190B1 (en) 1999-01-07 2000-01-07 Method for preparing chiral amino acids
DK00900532T DK1140794T3 (da) 1999-01-07 2000-01-07 Hidtil ukendt fremgangsmåde til fremstilling af chirale aminosyrer
IL14417300A IL144173A (en) 1999-01-07 2000-01-07 A method for making chiral amino acids
AU30511/00A AU3051100A (en) 1999-01-07 2000-01-07 Novel method for preparing chiral amino acids
DE60007835T DE60007835T2 (de) 1999-01-07 2000-01-07 Verfahren zur herstellung von chiralen aminosäuren
EP00900532A EP1140794B1 (fr) 1999-01-07 2000-01-07 Nouveau procede de preparation d'aminoacides chiraux

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9900202A FR2788271B1 (fr) 1999-01-07 1999-01-07 Nouveau procede de preparation d'aminoacides chiraux
FR99/00202 1999-01-07

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PCT/FR2000/000020 WO2000040545A1 (fr) 1999-01-07 2000-01-07 Nouveau procede de preparation d'aminoacides chiraux

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US (1) US6683190B1 (ja)
EP (1) EP1140794B1 (ja)
JP (1) JP2002534407A (ja)
KR (1) KR100648029B1 (ja)
CN (1) CN1163472C (ja)
AT (1) ATE258161T1 (ja)
AU (1) AU3051100A (ja)
BR (1) BR0008586B1 (ja)
CA (1) CA2358116A1 (ja)
DE (1) DE60007835T2 (ja)
DK (1) DK1140794T3 (ja)
ES (1) ES2209803T3 (ja)
FR (1) FR2788271B1 (ja)
HU (1) HUP0200327A2 (ja)
IL (1) IL144173A (ja)
PT (1) PT1140794E (ja)
WO (1) WO2000040545A1 (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003033473A1 (fr) * 2001-10-10 2003-04-24 Kaneka Corporation Nouveau derive d'hydantoine a substitution en position 5 et son procede de production
US6759551B1 (en) 2000-11-03 2004-07-06 Bayer Cropscience S.A. Chiral (s- or r-methylphenylglycine) amino acid crystal and method for preparing same
US7612226B2 (en) 2005-04-28 2009-11-03 Pfizer Inc. Amino acid derivatives
JP2009292842A (ja) * 2002-06-05 2009-12-17 Kaneka Corp 光学活性α−メチルシステイン誘導体の製造方法

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CN101255136B (zh) * 2008-03-11 2011-08-17 武汉大学 5-环丙烷螺环乙内酰脲衍生物及其制备方法和应用
CN104016872B (zh) * 2014-05-28 2016-07-06 浙江工业大学 一种手性α-非天然氨基酸的合成方法

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WO1998003490A1 (fr) * 1996-07-22 1998-01-29 Rhone Poulenc Agro Intermediaires pour la preparation de 2-imidazoline-5-ones

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JPS60224661A (ja) * 1984-04-23 1985-11-09 Mitsui Toatsu Chem Inc α−アミノ酸の製造方法
JPS62103049A (ja) * 1985-10-28 1987-05-13 Mitsui Toatsu Chem Inc α−アミノ酸の製造法
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6759551B1 (en) 2000-11-03 2004-07-06 Bayer Cropscience S.A. Chiral (s- or r-methylphenylglycine) amino acid crystal and method for preparing same
WO2003033473A1 (fr) * 2001-10-10 2003-04-24 Kaneka Corporation Nouveau derive d'hydantoine a substitution en position 5 et son procede de production
JP2009292842A (ja) * 2002-06-05 2009-12-17 Kaneka Corp 光学活性α−メチルシステイン誘導体の製造方法
US8993800B2 (en) 2002-06-05 2015-03-31 Kaneka Corporation Process for producing optically active α-methylcysteine derivative
US7612226B2 (en) 2005-04-28 2009-11-03 Pfizer Inc. Amino acid derivatives

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BR0008586B1 (pt) 2010-11-30
ATE258161T1 (de) 2004-02-15
US6683190B1 (en) 2004-01-27
IL144173A (en) 2004-06-20
HUP0200327A2 (en) 2002-05-29
FR2788271B1 (fr) 2001-02-09
CA2358116A1 (fr) 2000-07-13
KR20010113643A (ko) 2001-12-28
AU3051100A (en) 2000-07-24
DE60007835D1 (de) 2004-02-26
JP2002534407A (ja) 2002-10-15
CN1337938A (zh) 2002-02-27
PT1140794E (pt) 2004-04-30
ES2209803T3 (es) 2004-07-01
CN1163472C (zh) 2004-08-25
DE60007835T2 (de) 2004-11-04
BR0008586A (pt) 2001-10-16
IL144173A0 (en) 2002-05-23
FR2788271A1 (fr) 2000-07-13
EP1140794B1 (fr) 2004-01-21
KR100648029B1 (ko) 2006-11-23
DK1140794T3 (da) 2004-02-16
EP1140794A1 (fr) 2001-10-10

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